When in notech'd mode, it's also excellent. You can move the wheel, without touching the mouse, and mouse won't move. And, no accidental scroll.

I set the wheel to free-spin. This is especially useful in Linux, because in Linux, there's no scroll wheel acceleration.

When browsing social network sites such as twitter and facebook, free-spin is heaven.

Though, first you'll need to get used to, by spin, then put finger on it to stop spin.

Buttons

👎 The top 3 buttons on the left (labeled G8 G9 G10), requires very strong pressure to press. This means, the 3 buttons becomes essentially not usable for things you need to do often (for example, such as switching app, previous/next tab.).

Thumb Buttons

👍 4 thumb buttons are fantastic. Very easy to press. Very easy to hit the button you want. Never accidental click.

Weight

Short Battery Life

• At the bottom of the mouse, there's a on/off switch. You can turn it off to save battery life.

• The battery lasts for about 3 days, even if you set polling rate and power consumption to lowest. This means, you should plug-in every night, or, just use it plugged-in all the time like a wired mouse.

On-Board Memory, Yes

This mouse stores your key settings in the device. That means, once you use Logitech's software to set your keys, you can plug this mouse in any computer, and you'll have your keys. No need to install software.